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<blockquote data-quote="mtptl77" data-source="post: 6884761" data-attributes="member: 622588">First of all, ignore any &quot;max&quot; power ratings, both on the amps and the subwoofers. They have no purpose except to add more confusion.Ideally, you&#039;d want the RMS rating of the amplifier to be the same as the sub&#039;s RMS rating. You can use a much lower power amp without a problem; subwoofers aren&#039;t damaged by under-powering. You can use a slightly higher powered amp, but you&#039;ll need to be more careful.With your 400-watt RMS sub, you can use anything from a 50-watt to 450 watt RMS amplifier.Be sure to match the impedance ratings of the sub and the amp. Most amps produce more power at 2 ohms than at 4 ohms, so if you have a 4 ohm subwoofer, make sure you&#039;re looking at the right power rating. Also, make sure that the amplifier&#039;s power rating is CEA-2006 compliant. This means that the power rating method conforms to a universal standard, so you don&#039;t have to worry that it&#039;s over-rated.==============<a href="http://www.frontdoors.uk.com" target="_blank">UPVC Doors</a> | <a href="http://www.frontdoors.uk.com" target="_blank">UPVC Front Doors</a></blockquote>

[QUOTE="mtptl77, post: 6884761, member: 622588"] First of all, ignore any "max" power ratings, both on the amps and the subwoofers. They have no purpose except to add more confusion. Ideally, you'd want the RMS rating of the amplifier to be the same as the sub's RMS rating. You can use a much lower power amp without a problem; subwoofers aren't damaged by under-powering. You can use a slightly higher powered amp, but you'll need to be more careful. With your 400-watt RMS sub, you can use anything from a 50-watt to 450 watt RMS amplifier. Be sure to match the impedance ratings of the sub and the amp. Most amps produce more power at 2 ohms than at 4 ohms, so if you have a 4 ohm subwoofer, make sure you're looking at the right power rating. Also, make sure that the amplifier's power rating is CEA-2006 compliant. This means that the power rating method conforms to a universal standard, so you don't have to worry that it's over-rated. ============== [URL="http://www.frontdoors.uk.com"]UPVC Doors[/URL] | [URL="http://www.frontdoors.uk.com"]UPVC Front Doors[/URL] [/QUOTE]

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